Java software engineer jobs in Harpenden - Page 2Create job alerts

We are looking for a Senior Software Engineer who will be responsible for designing, developing, and deploying high-quality software solutions. You will work on complex software projects, contributing to the architecture, development, and improvement of software systems. This role involves mentoring

We’re partnering with a leading global financial institution seeking experienced Java Contractors to join high-impact engineering teams delivering scalable, mission-critical platforms. Strong Java development experience (Java 11+).

We are seeking multiple Senior Java Engineers to join the programme engineering team. Strong, demonstrable experience as a Senior Java Engineer in a production environment. Senior Java Engineers (12x) — Contract - (Financial Services / Investment Management).

A Java Developer (2-5 years experience) designs, codes, tests, and maintains scalable Java applications, collaborating with teams, debugging issues, and using frameworks like Spring/Hibernate, focusing on clean, efficient, object-oriented code, participating in the full SDLC. Number] years of profes

We are seeking a highly skilled Java Software Engineer's to work on a UK Government programme. Strong recent experience with Java 20 or above. Experience with software patterns.

Brio Digital are supporting a consultancy on a major NHS digital programme and are looking for experienced Java Developers to join an established engineering team. You will contribute to the design, build, and delivery of complex, high-availability digital solutions within a large-scale NHS environm

SOW & Deliverables - Develop and maintain scalable Java-based services and applications - Build and support Spring Boot microservices - Work with Kafka and event-driven architectures - Contribute to agile delivery using Test-Driven Development (TDD) principles - Support engineering best practices a

Role Overview - Location: Milton Keynes (Once per month onsite /Flexible working available) - Package: Up-to 95,000 Basic, bonus scheme + benefits - Industry: Fintech / Digital Banking What You’ll Be Doing - Leading the design and delivery of full stack features across backend and frontend syst

Key Responsibilities - Develop and maintain scalable digital services and applications - Work across backend and full-stack development activities using modern technologies - Write clean, maintainable code following Test-Driven Development (TDD) principles - Collaborate with multidisciplinary teams

A dynamic sports betting startup in London is seeking Java Software Developers to join their innovative team. The role involves working with quantitative researchers and talented engineers to build data integrations and support systematic trading models. Candidates should have at least 3 years of Ja

Software Engineer III – (Java / Databricks / API). The Software Engineer III performs moderately complex research, design, and development work on systems that compute large‑scale metrics using distributed processing, search indexing, and graph‑based data structures. This role focuses on imple

A global financial technology leader is seeking a Dev/System Engineer in London. The ideal candidate will have 2 to 5 years of experience in systems development, specifically with Java and C++. The role demands a problem-solving mindset and proficiency in languages like Java and C++.

Practice TDD and BDD engineering techniques. Have an understanding of Java IOC frameworks such as Spring or Guice. Are passionate technologists who care about the code they engineer the quality and elegance of the solutions they build.

We’re looking for a Mid/Senior Backend Engineer to join a team that keeps frameworks lean and focuses on what matters: clean, maintainable code, shipped fast with TDD, DDD, and continuous integration and delivery. Our stack includes Java 17/21, GCP, Kubernetes, Grafana, Prometheus, NewRelic, Postg

Mentor and guide engineers to improve technical capability and engineering standards. TP ICAP are looking for a Senior Java Developer delivering low‑latency, highly available trading system components with deep expertise in Java, FIX connectivity, and distributed real‑time messaging. Strong expe

Experience with JavaScript/Typescript, Angular, and knowledge of Continuous Integration/Delivery is essential.

Backend Software Engineer (Java). My client in the automotive industry is seeking an experienced Senior Backend Software Engineer to join their Identity Management Services team, focusing on the core platform work that powers our identity infrastructure. You will be responsible for ensuring the plat

Elsevier in Greater London is seeking a Software Engineer III to contribute to the development of ScienceDirect's cloud-hosted web applications. Candidates should be proficient in Java, Spring, and JavaScript, with a passion for Agile methodologies.

We are looking for experienced fullstack Java Software Engineers to support projects across UK Government and Law Enforcement. The role is hands‑on and focused on building high quality software using modern engineering practices. You'll design, build and maintain Java based microservices, applying

Java Software Developer – Sports betting Hedge fund startup - London. A couple of Java Software Developers are required for an exciting and innovative Sports betting hedge fund startup based in London. Contribute to greenfield Java work, providing challenging and rewarding software solutions.

Optamor is seeking a Software Engineer with strong C++, Java, and Python programming skills to join Lockheed Martin in Ampthill, Bedfordshire. Candidates should demonstrate proven software engineering experience and strong communication skills.

Public Sector Resourcing, managed by AMS, is looking for a Software Engineer (Java) for a 14-month contract. Responsibilities include developing high-quality applications using Java and Spring Boot, designing RESTful APIs, and working with PostgreSQL and GCP services.

Software Engineer Java Kafka API (PR/100680) London, England. Software Engineer / Developer (Java Kafka API) London / WFH to £90k. Software Engineer / Developer (Java Kafka Spring Boot AWS microservices) opportunity.

A leading financial services institution in Greater London is seeking a Lead Software Engineer to design scalable technology solutions that support business goals. The ideal candidate has a Bachelor's in Computer Science, proficiency in programming languages such as Python and JavaScript, and strong

A leading software company in Greater London seeks an AI Engineer to innovate at the intersection of engineering and AI. Candidates should possess a degree in relevant fields and experience in ML/AI engineering.

We are seeking highly skilled Software Development Engineers (SDEs) for a green field project to drive the design, development and implementation of software solution for next generation customer fulfilment system. As a key member of our engineering team, you will develop robust, scalable and effici

Professional experience in ML/AI engineering or software engineering. You’ll collaborate across engineering, product, knowledge engineering, and customer‑faceting teams to ship features that genuinely make work smarter. If you’re driven by solving real problems with well‑engineered solutions

As a Lead Software Engineer at JPMorgan Chase within the Data Platform & Strategy team within Corporate Risk Technology, you will design, build, and enhance advanced data engineering solutions. Drive communities of practice across Software Engineering to promote new and leading‑edge technologies.

Design and implement end‑to‑end systems using your deep JVM and Java ecosystem expertise. Apply SOLID principles and cohesive design to build scalable software. Mentor and support fellow engineers, fostering a culture of continuous learning.

Act as a force multiplier for the engineering team, coaching senior talent and fostering a culture of technical excellence. Principal Backend Engineer | London (Hybrid) | Up to £150k. We are looking for a Principal Backend Engineer to join their London hub.

As a Senior Software Engineer, you will own large-sized, impactful projects within the domain. Nice to have: Some experience building frontend with technologies like React using Javascript, or Typescript. You’ll consistently define and implement technical solutions or efficient operational process

Software Engineer III- (Java/ Databricks /API). The Software Engineer III performs moderately complex research, design, and development work on systems that compute large-scale metrics using distributed processing, search indexing, and graph-based data structures. The SciVal Development Team is a cr

As a Lead Software Engineer at JPMorgan Chase within the Commercial & Investment Bank's Equities Technology team, you are an integral part of an agile team that works to enhance, build, and deliver trusted market-leading technology products in a secure, stable, and scalable way. Leads communities of

Java Software Engineer**RELX is a global provider of information-based analytics and decision tools for professional and business customers, enabling them to make better decisions, get better results and be more productive. As a Software Engineer, you will build capabilities to improve the quality o

We are seeking highly skilled Software Development Engineers (SDEs) for a green field project to drive the design, development and implementation of software solution for next generation customer fulfilment system. As a key member of our engineering team, you will develop robust, scalable and effici

A leading space engineering firm in Greater London is seeking a Ground Segment DevOps Engineer to join their innovative team. This role involves designing and maintaining the Mission Control System, implementing software modules in Java and Python, and supporting mission operations subsystems. Ideal

A leading technology solutions provider in the United Kingdom is looking for an Intermediate Java Software Engineer to join their team. You will be responsible for developing high-quality software solutions, participating in Agile processes, and utilizing Java and its frameworks.

This role sits at the intersection of core Java engineering and developer experience. Join the Engineering Enablement team at the heart of Quote Modernisation the most significant engineering transformations Quote has undertaken in recent years. You'll write high‑quality production Java, but you'l

Role: Software Engineer (Java) – Up to £120,000 + Bonus + Package. Complex engineering challenges alongside some of the top talent in fintech. Engineers are treated as the company’s #1 asset.

Bowden Brown is seeking a talented Enterprise Software Engineer to join their growing technology team in London. The role involves building high-performance financial software and collaborating with operations and middle office teams to solve complex business problems. Candidates should have strong

We're seeking a highly motivated and experienced engineer to play a key role in our Customer Service Engineering Group. The Customer Service Engineering group is all about making things better for our customers. Starling engineers are excited about helping us deliver new features, regardless of what

We’re seeking a highly motivated and experienced engineer to play a key role in our Customer Service Engineering Group. For the most part we code in Java, and though we are looking for someone with at least. Java, which makes up the majority of our backend codebase.

Join us and take your software engineering career to new heights. As a Lead Software Engineer in the Markets Technology team, you will design and deliver secure, stable, and scalable technology solutions that support our business objectives. Formal training or certification on software engineering c

Hunter Bond is seeking a Software Engineer (Java) in London, offering up to £120,000 plus bonus and package. The role involves working on high-performance financial platforms and complex engineering challenges in a collaborative, friendly environment.

You’ll write high-quality production Java, but you’ll also care deeply about the experience of engineers building on what you create. Join the Engineering Enablement team at the heart of Quote Modernisation the most significant engineering transformations Quote has undertaken in recent years. Ap

As a Staff Engineer, you'll work across multiple engineering teams, driving technical design, elevating engineering standards and ensuring sound decision-making across the broader Sainsbury’s Tech ecosystem. Then you’ll realise that ours is a modern software engineering environment because it ha

You have a product engineer mindset and a track record of delivering high quality software that adjusts to business and product needs to provide a great user experience in a timely manner. We're looking for people who have a curious mindset, thrive in collaborative squads, and are passionate about b

IO Associates is looking for a Lead Software Engineer in Malvern to lead a project focusing on modernizing software systems. The role involves gathering requirements, full-cycle engineering, and solving complex technical challenges. Ideal candidates should have a strong background in Java, experienc